Update dependency js to ^0.7.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
js (source)	dependencies	minor	^0.6.0 -> ^0.7.0

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Release Notes

dart-lang/sdk (js)

v0.7.1

• README update to indicate that dart:js_interop should be preferred.

v0.7.0

• Remove dependency on dart:js.
• Update SDK lower constraint to 3.1.0-66.0.dev.
• Update SDK upper constraint to 4.0.0.
• Breaking Change: Moved annotations to single location in
  dart:_js_annotations. This makes it easier to avoid collisions with
  dart:js_interop's @JS, as you will now see a static error instead of it
  resolving in favor of the package definition. However, since this may result
  in breakages in previously working code, this is treated as a breaking change.

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